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SVTPerformance's Chain of Restaurants
The Blower Bistro
whipple with turbo
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<blockquote data-quote="HotStart" data-source="post: 10319574" data-attributes="member: 75155"><p>I have no first hand experience with a compound setup utilizing a twin screw, but it is my understanding that it is not the seals themselves which are the problem. I'm inclined to believe that the issue of blowing the seals out (or lack of practical use even if the seals are fine) is due to the extreme amount of internal pressure within the case of a TS, that is not present on a roots type blower. Given that a roots blower is nothing more than an air pump, and a twin screw internally compresses the air, when air is forced into a roots blower, it is able to flow through, and the only problem arises after the volume of air being pushed through surpasses the volume the the blower would be able to intake on its own. It is at this point when the blower rotors becomes a restriction. </p><p></p><p>On a twin screw, you cannot "blow through" the rotors in the same way that you can with the Eaton. If there are seal problems, then it is likely that the pressure created within the case during internal rotor compression with the air being forced in is far greater than the unit was ever designed for. I know that there are twinscrews being used in compound setups, so it is a possibility. It would seem to me though that after the intersection point in airflow where the turbos are forcing in a greater volume than the blower can ingest, that a twinscrew would become even more of a restriction than the eaton would (displacement being equal) since the rotor tolerances are so close that the air could not be forced through like with a roots setup.</p><p></p><p>This link from KB shows a great visual of the difference in rotor design between the two:</p><p></p><p><a href="http://www.kennebell.net/techinfo/general-info/twinscrew-vs-roots-fromcatalog.pdf" target="_blank">http://www.kennebell.net/techinfo/general-info/twinscrew-vs-roots-fromcatalog.pdf</a></p><p></p><p><img src="http://www.kennebell.net/techinfo/general-info/twinscrew-vs-roots-fromcatalog.pdf" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="HotStart, post: 10319574, member: 75155"] I have no first hand experience with a compound setup utilizing a twin screw, but it is my understanding that it is not the seals themselves which are the problem. I'm inclined to believe that the issue of blowing the seals out (or lack of practical use even if the seals are fine) is due to the extreme amount of internal pressure within the case of a TS, that is not present on a roots type blower. Given that a roots blower is nothing more than an air pump, and a twin screw internally compresses the air, when air is forced into a roots blower, it is able to flow through, and the only problem arises after the volume of air being pushed through surpasses the volume the the blower would be able to intake on its own. It is at this point when the blower rotors becomes a restriction. On a twin screw, you cannot "blow through" the rotors in the same way that you can with the Eaton. If there are seal problems, then it is likely that the pressure created within the case during internal rotor compression with the air being forced in is far greater than the unit was ever designed for. I know that there are twinscrews being used in compound setups, so it is a possibility. It would seem to me though that after the intersection point in airflow where the turbos are forcing in a greater volume than the blower can ingest, that a twinscrew would become even more of a restriction than the eaton would (displacement being equal) since the rotor tolerances are so close that the air could not be forced through like with a roots setup. This link from KB shows a great visual of the difference in rotor design between the two: [url]http://www.kennebell.net/techinfo/general-info/twinscrew-vs-roots-fromcatalog.pdf[/url] [IMG]http://www.kennebell.net/techinfo/general-info/twinscrew-vs-roots-fromcatalog.pdf[/IMG] [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
whipple with turbo
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